<!DOCTYPE html>
<html lang="en">
  <head>
    <title>IGListCollectionViewLayout Class Reference</title>
    <link rel="stylesheet" type="text/css" href="../css/jazzy.css" />
    <link rel="stylesheet" type="text/css" href="../css/highlight.css" />
    <meta charset='utf-8'>
    <script src="../js/jquery.min.js" defer></script>
    <script src="../js/jazzy.js" defer></script>
    
  </head>
  <body>
    <a name="//apple_ref/objc/Class/IGListCollectionViewLayout" class="dashAnchor"></a>
    <a title="IGListCollectionViewLayout Class Reference"></a>
    <header>
      <div class="content-wrapper">
        <p><a href="../index.html">IGListKit Docs</a> (98% documented)</p>
        <p class="header-right"><a href="https://github.com/Instagram/IGListKit"><img src="../img/gh.png"/>View on GitHub</a></p>
      </div>
    </header>
    <div class="content-wrapper">
      <p id="breadcrumbs">
        <a href="../index.html">IGListKit Reference</a>
        <img id="carat" src="../img/carat.png" />
        IGListCollectionViewLayout Class Reference
      </p>
    </div>
    <div class="content-wrapper">
      <nav class="sidebar">
        <ul class="nav-groups">
          <li class="nav-group-name">
            <a href="../Guides.html">Guides</a>
            <ul class="nav-group-tasks">
              <li class="nav-group-task">
                <a href="../best-practices-and-faq.html">Best Practices and FAQ</a>
              </li>
              <li class="nav-group-task">
                <a href="../generating-your-models-using-remodel.html">Generating your models using remodel</a>
              </li>
              <li class="nav-group-task">
                <a href="../getting-started.html">Getting Started</a>
              </li>
              <li class="nav-group-task">
                <a href="../iglistdiffable-and-equality.html">IGListDiffable and Equality</a>
              </li>
              <li class="nav-group-task">
                <a href="../installation.html">Installation</a>
              </li>
              <li class="nav-group-task">
                <a href="../migration.html">Migration</a>
              </li>
              <li class="nav-group-task">
                <a href="../modeling-and-binding.html">Modeling and Binding</a>
              </li>
              <li class="nav-group-task">
                <a href="../vision.html">VISION</a>
              </li>
              <li class="nav-group-task">
                <a href="../working-with-core-data.html">Working with Core Data</a>
              </li>
              <li class="nav-group-task">
                <a href="../working-with-uicollectionview.html">Working with UICollectionView</a>
              </li>
            </ul>
          </li>
          <li class="nav-group-name">
            <a href="../Classes.html">Classes</a>
            <ul class="nav-group-tasks">
              <li class="nav-group-task">
                <a href="../Classes/IGListAdapter.html">IGListAdapter</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListAdapterUpdater.html">IGListAdapterUpdater</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListBatchUpdateData.html">IGListBatchUpdateData</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListBindingSectionController.html">IGListBindingSectionController</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListCollectionView.html">IGListCollectionView</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListCollectionViewLayout.html">IGListCollectionViewLayout</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListGenericSectionController.html">IGListGenericSectionController</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListIndexPathResult.html">IGListIndexPathResult</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListIndexSetResult.html">IGListIndexSetResult</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListMoveIndex.html">IGListMoveIndex</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListMoveIndexPath.html">IGListMoveIndexPath</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes.html#/c:objc(cs)IGListReloadDataUpdater">IGListReloadDataUpdater</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListSectionController.html">IGListSectionController</a>
              </li>
              <li class="nav-group-task">
                <a href="../Classes/IGListSingleSectionController.html">IGListSingleSectionController</a>
              </li>
            </ul>
          </li>
          <li class="nav-group-name">
            <a href="../Constants.html">Constants</a>
            <ul class="nav-group-tasks">
              <li class="nav-group-task">
                <a href="../Constants.html#/c:@IGListKitVersionNumber">IGListKitVersionNumber</a>
              </li>
              <li class="nav-group-task">
                <a href="../Constants.html#/c:@IGListKitVersionString">IGListKitVersionString</a>
              </li>
            </ul>
          </li>
          <li class="nav-group-name">
            <a href="../Enums.html">Enumerations</a>
            <ul class="nav-group-tasks">
              <li class="nav-group-task">
                <a href="../Enums/IGListAdapterUpdateType.html">IGListAdapterUpdateType</a>
              </li>
              <li class="nav-group-task">
                <a href="../Enums/IGListDiffOption.html">IGListDiffOption</a>
              </li>
              <li class="nav-group-task">
                <a href="../Enums/IGListExperiment.html">IGListExperiment</a>
              </li>
            </ul>
          </li>
          <li class="nav-group-name">
            <a href="../Protocols.html">Protocols</a>
            <ul class="nav-group-tasks">
              <li class="nav-group-task">
                <a href="../Protocols/IGListAdapterDataSource.html">IGListAdapterDataSource</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListAdapterDelegate.html">IGListAdapterDelegate</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListAdapterMoveDelegate.html">IGListAdapterMoveDelegate</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListAdapterPerformanceDelegate.html">IGListAdapterPerformanceDelegate</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListAdapterUpdateListener.html">IGListAdapterUpdateListener</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListAdapterUpdaterDelegate.html">IGListAdapterUpdaterDelegate</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListBatchContext.html">IGListBatchContext</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListBindable.html">IGListBindable</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListBindingSectionControllerDataSource.html">IGListBindingSectionControllerDataSource</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListBindingSectionControllerSelectionDelegate.html">IGListBindingSectionControllerSelectionDelegate</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListCollectionContext.html">IGListCollectionContext</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListCollectionViewDelegateLayout.html">IGListCollectionViewDelegateLayout</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListCollectionViewLayoutCompatible.html">IGListCollectionViewLayoutCompatible</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListDiffable.html">IGListDiffable</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListDisplayDelegate.html">IGListDisplayDelegate</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListScrollDelegate.html">IGListScrollDelegate</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListSingleSectionControllerDelegate.html">IGListSingleSectionControllerDelegate</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListSupplementaryViewSource.html">IGListSupplementaryViewSource</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListTransitionDelegate.html">IGListTransitionDelegate</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListUpdatingDelegate.html">IGListUpdatingDelegate</a>
              </li>
              <li class="nav-group-task">
                <a href="../Protocols/IGListWorkingRangeDelegate.html">IGListWorkingRangeDelegate</a>
              </li>
            </ul>
          </li>
          <li class="nav-group-name">
            <a href="../Type%20Definitions.html">Type Definitions</a>
            <ul class="nav-group-tasks">
              <li class="nav-group-task">
                <a href="../Type%20Definitions/IGListCollectionScrollingTraits.html">IGListCollectionScrollingTraits</a>
              </li>
              <li class="nav-group-task">
                <a href="../Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListCollectionViewBlock">IGListCollectionViewBlock</a>
              </li>
              <li class="nav-group-task">
                <a href="../Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListItemUpdateBlock">IGListItemUpdateBlock</a>
              </li>
              <li class="nav-group-task">
                <a href="../Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListObjectTransitionBlock">IGListObjectTransitionBlock</a>
              </li>
              <li class="nav-group-task">
                <a href="../Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListReloadUpdateBlock">IGListReloadUpdateBlock</a>
              </li>
              <li class="nav-group-task">
                <a href="../Type%20Definitions.html#/c:IGListSingleSectionController.h@T@IGListSingleSectionCellConfigureBlock">IGListSingleSectionCellConfigureBlock</a>
              </li>
              <li class="nav-group-task">
                <a href="../Type%20Definitions.html#/c:IGListSingleSectionController.h@T@IGListSingleSectionCellSizeBlock">IGListSingleSectionCellSizeBlock</a>
              </li>
              <li class="nav-group-task">
                <a href="../Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListToObjectBlock">IGListToObjectBlock</a>
              </li>
              <li class="nav-group-task">
                <a href="../Type%20Definitions.html#/c:IGListAdapter.h@T@IGListUpdaterCompletion">IGListUpdaterCompletion</a>
              </li>
              <li class="nav-group-task">
                <a href="../Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListUpdatingCompletion">IGListUpdatingCompletion</a>
              </li>
            </ul>
          </li>
          <li class="nav-group-name">
            <a href="../Functions.html">Functions</a>
            <ul class="nav-group-tasks">
              <li class="nav-group-task">
                <a href="../Functions.html#/c:@F@IGListDiff">IGListDiff</a>
              </li>
              <li class="nav-group-task">
                <a href="../Functions.html#/c:@F@IGListDiffExperiment">IGListDiffExperiment</a>
              </li>
              <li class="nav-group-task">
                <a href="../Functions.html#/c:@F@IGListDiffPaths">IGListDiffPaths</a>
              </li>
              <li class="nav-group-task">
                <a href="../Functions.html#/c:@F@IGListDiffPathsExperiment">IGListDiffPathsExperiment</a>
              </li>
              <li class="nav-group-task">
                <a href="../Functions.html#/c:IGListExperiments.h@F@IGListExperimentEnabled">IGListExperimentEnabled</a>
              </li>
            </ul>
          </li>
          <li class="nav-group-name">
            <a href="../Structs.html">Structures</a>
            <ul class="nav-group-tasks">
              <li class="nav-group-task">
                <a href="../Structs/IGListCollectionScrollingTraits.html">IGListCollectionScrollingTraits</a>
              </li>
            </ul>
          </li>
        </ul>
      </nav>
      <article class="main-content">
        <section>
          <section class="section">
            <h1>IGListCollectionViewLayout</h1>
              <div class="declaration">
                <div class="language">
                  <pre class="highlight objective_c"><code>
<span class="k">@interface</span> <span class="nc">IGListCollectionViewLayout</span>
    <span class="p">:</span> <span class="nc">UICollectionViewLayout</span> <span class="o">&lt;</span><span class="n"><a href="../Protocols/IGListCollectionViewLayoutCompatible.html">IGListCollectionViewLayoutCompatible</a></span><span class="o">&gt;</span></code></pre>

                </div>
              </div>
            <p>This UICollectionViewLayout subclass is for vertically or horizontally scrolling lists of data with variable widths and
heights. It supports an infinite number of sections and items. All work is done on the main thread, and while extremely efficient,
care must be taken not to stall the main thread in sizing delegate methods.</p>

<p>This layout piggybacks on the mechanics of UICollectionViewFlowLayout in that:</p>

<ul>
<li>Your UICollectionView data source must also conform to UICollectionViewDelegateFlowLayout</li>
<li>Header support given via UICollectionElementKindSectionHeader</li>
</ul>

<p>All UICollectionViewDelegateFlowLayout methods are required and used by this layout:</p>
<pre class="highlight objective_c"><code><span class="k">-</span> <span class="p">(</span><span class="n">CGSize</span><span class="p">)</span><span class="nf">collectionView</span><span class="p">:(</span><span class="n">UICollectionView</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionView</span> <span class="nf">layout</span><span class="p">:(</span><span class="n">UICollectionViewLayout</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionViewLayout</span> <span class="nf">sizeForItemAtIndexPath</span><span class="p">:(</span><span class="n">NSIndexPath</span> <span class="o">*</span><span class="p">)</span><span class="nv">indexPath</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="n">UIEdgeInsets</span><span class="p">)</span><span class="nf">collectionView</span><span class="p">:(</span><span class="n">UICollectionView</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionView</span> <span class="nf">layout</span><span class="p">:(</span><span class="n">UICollectionViewLayout</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionViewLayout</span> <span class="nf">insetForSectionAtIndex</span><span class="p">:(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nv">section</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="n">CGFloat</span><span class="p">)</span><span class="nf">collectionView</span><span class="p">:(</span><span class="n">UICollectionView</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionView</span> <span class="nf">layout</span><span class="p">:(</span><span class="n">UICollectionViewLayout</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionViewLayout</span> <span class="nf">minimumLineSpacingForSectionAtIndex</span><span class="p">:(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nv">section</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="n">CGFloat</span><span class="p">)</span><span class="nf">collectionView</span><span class="p">:(</span><span class="n">UICollectionView</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionView</span> <span class="nf">layout</span><span class="p">:(</span><span class="n">UICollectionViewLayout</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionViewLayout</span> <span class="nf">minimumInteritemSpacingForSectionAtIndex</span><span class="p">:(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nv">section</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="n">CGSize</span><span class="p">)</span><span class="nf">collectionView</span><span class="p">:(</span><span class="n">UICollectionView</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionView</span> <span class="nf">layout</span><span class="p">:(</span><span class="n">UICollectionViewLayout</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionViewLayout</span> <span class="nf">referenceSizeForHeaderInSection</span><span class="p">:(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nv">section</span><span class="p">;</span>
</code></pre>

<p>In a vertically scrolling layout, sections and items are put into the same horizontal row until the max-x position
of an item extends beyond the width of the collection view. When that happens, the item is <q>newlined</q> to the next row.
The y position of that row is determined by the maximum height (including section insets) of the section/item of the previous row.</p>

<p>Ex. of a section (2,0) with a large width causing a newline.</p>
<pre class="highlight objective_c"><code><span class="o">|</span><span class="p">[</span> <span class="mi">0</span><span class="p">,</span><span class="mi">0</span> <span class="p">][</span> <span class="mi">1</span><span class="p">,</span><span class="mi">0</span> <span class="p">]</span>         <span class="o">|</span>
<span class="o">|</span><span class="p">[</span>         <span class="mi">2</span><span class="p">,</span><span class="mi">0</span>         <span class="p">]</span><span class="o">|</span>
</code></pre>

<p>A section with a non-zero height header will always cause that section to newline. Headers are always stretched to the
width of the collection view, pinched with the section insets.</p>

<p>Ex. of a section (2,0) with a header inset on the left/right.</p>
<pre class="highlight objective_c"><code><span class="o">|</span><span class="p">[</span> <span class="mi">0</span><span class="p">,</span><span class="mi">0</span> <span class="p">][</span> <span class="mi">1</span><span class="p">,</span><span class="mi">0</span> <span class="p">]</span>         <span class="o">|</span>
<span class="o">|</span> <span class="o">&gt;======</span><span class="n">header</span><span class="o">=======&lt;</span> <span class="o">|</span>
<span class="o">|</span> <span class="p">[</span> <span class="mi">2</span><span class="p">,</span><span class="mi">0</span> <span class="p">]</span>               <span class="o">|</span>
</code></pre>

<p>Section insets apply to items in the section no matter if they begin on a new row or are on the same row as a previous
section.</p>

<p>Ex. of a section (2) with multiple items and a left inset.</p>
<pre class="highlight objective_c"><code><span class="o">|</span><span class="p">[</span> <span class="mi">0</span><span class="p">,</span><span class="mi">0</span> <span class="p">][</span> <span class="mi">1</span><span class="p">,</span><span class="mi">0</span> <span class="p">]</span> <span class="o">&gt;</span><span class="p">[</span> <span class="mi">2</span><span class="p">,</span><span class="mi">0</span> <span class="p">]</span><span class="o">|</span>
<span class="o">|</span> <span class="o">&gt;</span><span class="p">[</span> <span class="mi">2</span><span class="p">,</span><span class="mi">1</span> <span class="p">][</span> <span class="mi">2</span><span class="p">,</span><span class="mi">2</span> <span class="p">][</span> <span class="mi">2</span><span class="p">,</span><span class="mi">3</span> <span class="p">]</span><span class="o">|</span>
</code></pre>

<p>Interitem spacing applies to items and sections within the same row. Line spacing only applies to items within the same
section.</p>

<p>In a horizontally scrolling layout, sections and items are flowed vertically until they need to be <q>newlined</q> to the 
next column. Headers, if used, are stretched to the height of the collection view, minus the section insets.</p>

<p>Please see the unit tests for more configuration examples and expected output.</p>

          </section>
          <section class="section task-group-section">
            <div class="task-group">
              <ul>
                <li class="item">
                  <div>
                    <code>
                    <a name="/c:objc(cs)IGListCollectionViewLayout(py)scrollDirection"></a>
                    <a name="//apple_ref/objc/Property/scrollDirection" class="dashAnchor"></a>
                    <a class="token" href="#/c:objc(cs)IGListCollectionViewLayout(py)scrollDirection">scrollDirection</a>
                    </code>
                  </div>
                  <div class="height-container">
                    <div class="pointer-container"></div>
                    <section class="section">
                      <div class="pointer"></div>
                      <div class="abstract">
                        <p>Direction in which layout will be scrollable; items will be flowed in the perpendicular direction, <q>newlining</q> when they
run out of space along that axis or when a non-zero header is found.</p>

                      </div>
                      <div class="declaration">
                        <h4>Declaration</h4>
                        <div class="language">
                          <p class="aside-title">Objective-C</p>
                          <pre class="highlight objective_c"><code><span class="k">@property</span> <span class="p">(</span><span class="n">readonly</span><span class="p">,</span> <span class="n">nonatomic</span><span class="p">)</span> <span class="n">UICollectionViewScrollDirection</span> <span class="n">scrollDirection</span><span class="p">;</span></code></pre>

                        </div>
                        <div class="language">
                          <p class="aside-title">Swift</p>
                          <pre class="highlight swift"><code><span class="k">var</span> <span class="nv">scrollDirection</span><span class="p">:</span> <span class="kt">UICollectionView</span><span class="o">.</span><span class="kt">ScrollDirection</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>

                        </div>
                      </div>
                    </section>
                  </div>
                </li>
                <li class="item">
                  <div>
                    <code>
                    <a name="/c:objc(cs)IGListCollectionViewLayout(py)stickyHeaderYOffset"></a>
                    <a name="//apple_ref/objc/Property/stickyHeaderYOffset" class="dashAnchor"></a>
                    <a class="token" href="#/c:objc(cs)IGListCollectionViewLayout(py)stickyHeaderYOffset">stickyHeaderYOffset</a>
                    </code>
                  </div>
                  <div class="height-container">
                    <div class="pointer-container"></div>
                    <section class="section">
                      <div class="pointer"></div>
                      <div class="abstract">
                        <p>Set this to adjust the offset of the sticky headers in the scrolling direction. Can be used to change the sticky 
header position as UI like the navigation bar is scrolled offscreen. In a vertically scrolling layout, changing 
this to the height of the navigation bar will give the effect of the headers sticking to the nav as it is collapsed.</p>
<div class="aside aside-note">
    <p class="aside-title">Note</p>
    Changing the value on this method will invalidate the layout every time.

</div>

                      </div>
                      <div class="declaration">
                        <h4>Declaration</h4>
                        <div class="language">
                          <p class="aside-title">Objective-C</p>
                          <pre class="highlight objective_c"><code><span class="k">@property</span> <span class="p">(</span><span class="n">assign</span><span class="p">,</span> <span class="n">readwrite</span><span class="p">,</span> <span class="n">nonatomic</span><span class="p">)</span> <span class="n">CGFloat</span> <span class="n">stickyHeaderYOffset</span><span class="p">;</span></code></pre>

                        </div>
                        <div class="language">
                          <p class="aside-title">Swift</p>
                          <pre class="highlight swift"><code><span class="k">var</span> <span class="nv">stickyHeaderYOffset</span><span class="p">:</span> <span class="kt">CGFloat</span> <span class="p">{</span> <span class="k">get</span> <span class="k">set</span> <span class="p">}</span></code></pre>

                        </div>
                      </div>
                    </section>
                  </div>
                </li>
                <li class="item">
                  <div>
                    <code>
                    <a name="/c:objc(cs)IGListCollectionViewLayout(py)showHeaderWhenEmpty"></a>
                    <a name="//apple_ref/objc/Property/showHeaderWhenEmpty" class="dashAnchor"></a>
                    <a class="token" href="#/c:objc(cs)IGListCollectionViewLayout(py)showHeaderWhenEmpty">showHeaderWhenEmpty</a>
                    </code>
                  </div>
                  <div class="height-container">
                    <div class="pointer-container"></div>
                    <section class="section">
                      <div class="pointer"></div>
                      <div class="abstract">
                        <p>Set this to <code>YES</code> to show sticky header when a section had no item. Default is <code>NO</code>.</p>

                      </div>
                      <div class="declaration">
                        <h4>Declaration</h4>
                        <div class="language">
                          <p class="aside-title">Objective-C</p>
                          <pre class="highlight objective_c"><code><span class="k">@property</span> <span class="p">(</span><span class="n">assign</span><span class="p">,</span> <span class="n">readwrite</span><span class="p">,</span> <span class="n">nonatomic</span><span class="p">)</span> <span class="n">BOOL</span> <span class="n">showHeaderWhenEmpty</span><span class="p">;</span></code></pre>

                        </div>
                        <div class="language">
                          <p class="aside-title">Swift</p>
                          <pre class="highlight swift"><code><span class="k">var</span> <span class="nv">showHeaderWhenEmpty</span><span class="p">:</span> <span class="kt">Bool</span> <span class="p">{</span> <span class="k">get</span> <span class="k">set</span> <span class="p">}</span></code></pre>

                        </div>
                      </div>
                    </section>
                  </div>
                </li>
                <li class="item">
                  <div>
                    <code>
                    <a name="/c:objc(cs)IGListCollectionViewLayout(py)experiments"></a>
                    <a name="//apple_ref/objc/Property/experiments" class="dashAnchor"></a>
                    <a class="token" href="#/c:objc(cs)IGListCollectionViewLayout(py)experiments">experiments</a>
                    </code>
                  </div>
                  <div class="height-container">
                    <div class="pointer-container"></div>
                    <section class="section">
                      <div class="pointer"></div>
                      <div class="abstract">
                        <p>A bitmask of experiments to conduct on the adapter.</p>

                      </div>
                      <div class="declaration">
                        <h4>Declaration</h4>
                        <div class="language">
                          <p class="aside-title">Objective-C</p>
                          <pre class="highlight objective_c"><code><span class="k">@property</span> <span class="p">(</span><span class="n">assign</span><span class="p">,</span> <span class="n">readwrite</span><span class="p">,</span> <span class="n">nonatomic</span><span class="p">)</span> <span class="n"><a href="../Enums/IGListExperiment.html">IGListExperiment</a></span> <span class="n">experiments</span><span class="p">;</span></code></pre>

                        </div>
                        <div class="language">
                          <p class="aside-title">Swift</p>
                          <pre class="highlight swift"><code><span class="k">var</span> <span class="nv">experiments</span><span class="p">:</span> <span class="kt"><a href="../Enums/IGListExperiment.html">IGListExperiment</a></span> <span class="p">{</span> <span class="k">get</span> <span class="k">set</span> <span class="p">}</span></code></pre>

                        </div>
                      </div>
                    </section>
                  </div>
                </li>
                <li class="item">
                  <div>
                    <code>
                    <a name="/c:objc(cs)IGListCollectionViewLayout(im)initWithStickyHeaders:scrollDirection:topContentInset:stretchToEdge:"></a>
                    <a name="//apple_ref/objc/Method/-initWithStickyHeaders:scrollDirection:topContentInset:stretchToEdge:" class="dashAnchor"></a>
                    <a class="token" href="#/c:objc(cs)IGListCollectionViewLayout(im)initWithStickyHeaders:scrollDirection:topContentInset:stretchToEdge:">-initWithStickyHeaders:scrollDirection:topContentInset:stretchToEdge:</a>
                    </code>
                  </div>
                  <div class="height-container">
                    <div class="pointer-container"></div>
                    <section class="section">
                      <div class="pointer"></div>
                      <div class="abstract">
                        <p>Create and return a new collection view layout.</p>

                      </div>
                      <div class="declaration">
                        <h4>Declaration</h4>
                        <div class="language">
                          <p class="aside-title">Objective-C</p>
                          <pre class="highlight objective_c"><code><span class="k">-</span> <span class="p">(</span><span class="n">nonnull</span> <span class="n">instancetype</span><span class="p">)</span>
    <span class="nf">initWithStickyHeaders</span><span class="p">:(</span><span class="n">BOOL</span><span class="p">)</span><span class="nv">stickyHeaders</span>
          <span class="nf">scrollDirection</span><span class="p">:(</span><span class="n">UICollectionViewScrollDirection</span><span class="p">)</span><span class="nv">scrollDirection</span>
          <span class="nf">topContentInset</span><span class="p">:(</span><span class="n">CGFloat</span><span class="p">)</span><span class="nv">topContentInset</span>
            <span class="nf">stretchToEdge</span><span class="p">:(</span><span class="n">BOOL</span><span class="p">)</span><span class="nv">stretchToEdge</span><span class="p">;</span></code></pre>

                        </div>
                        <div class="language">
                          <p class="aside-title">Swift</p>
                          <pre class="highlight swift"><code><span class="nf">init</span><span class="p">(</span><span class="nv">stickyHeaders</span><span class="p">:</span> <span class="kt">Bool</span><span class="p">,</span> <span class="nv">scrollDirection</span><span class="p">:</span> <span class="kt">UICollectionView</span><span class="o">.</span><span class="kt">ScrollDirection</span><span class="p">,</span> <span class="nv">topContentInset</span><span class="p">:</span> <span class="kt">CGFloat</span><span class="p">,</span> <span class="nv">stretchToEdge</span><span class="p">:</span> <span class="kt">Bool</span><span class="p">)</span></code></pre>

                        </div>
                      </div>
                      <div>
                        <h4>Parameters</h4>
                        <table class="graybox">
                          <tbody>
                            <tr>
                              <td>
                                <code>
                                <em>stickyHeaders</em>
                                </code>
                              </td>
                              <td>
                                <div>
                                  <p>Set to <code>YES</code> to stick section headers to the top of the bounds while scrolling.</p>
                                </div>
                              </td>
                            </tr>
                            <tr>
                              <td>
                                <code>
                                <em>scrollDirection</em>
                                </code>
                              </td>
                              <td>
                                <div>
                                  <p>Direction along which the collection view will be scrollable (if content size exceeds the frame size)</p>
                                </div>
                              </td>
                            </tr>
                            <tr>
                              <td>
                                <code>
                                <em>topContentInset</em>
                                </code>
                              </td>
                              <td>
                                <div>
                                  <p>The content inset (top or left, depending on scrolling direction) used to offset the sticky headers. Ignored if stickyHeaders is <code>NO</code>.</p>
                                </div>
                              </td>
                            </tr>
                            <tr>
                              <td>
                                <code>
                                <em>stretchToEdge</em>
                                </code>
                              </td>
                              <td>
                                <div>
                                  <p>Specifies whether to stretch width (in vertically scrolling layout) or height (horizontally scrolling) of last item to right/bottom edge when distance from last item to right/bottom edge &lt; epsilon(1)</p>
                                </div>
                              </td>
                            </tr>
                          </tbody>
                        </table>
                      </div>
                      <div>
                        <h4>Return Value</h4>
                        <p>A new collection view layout.</p>
                      </div>
                    </section>
                  </div>
                </li>
                <li class="item">
                  <div>
                    <code>
                    <a name="/c:objc(cs)IGListCollectionViewLayout(im)initWithStickyHeaders:topContentInset:stretchToEdge:"></a>
                    <a name="//apple_ref/objc/Method/-initWithStickyHeaders:topContentInset:stretchToEdge:" class="dashAnchor"></a>
                    <a class="token" href="#/c:objc(cs)IGListCollectionViewLayout(im)initWithStickyHeaders:topContentInset:stretchToEdge:">-initWithStickyHeaders:topContentInset:stretchToEdge:</a>
                    </code>
                  </div>
                  <div class="height-container">
                    <div class="pointer-container"></div>
                    <section class="section">
                      <div class="pointer"></div>
                      <div class="abstract">
                        <p>Create and return a new vertically scrolling collection view layout.</p>

                      </div>
                      <div class="declaration">
                        <h4>Declaration</h4>
                        <div class="language">
                          <p class="aside-title">Objective-C</p>
                          <pre class="highlight objective_c"><code><span class="k">-</span> <span class="p">(</span><span class="n">nonnull</span> <span class="n">instancetype</span><span class="p">)</span><span class="nf">initWithStickyHeaders</span><span class="p">:(</span><span class="n">BOOL</span><span class="p">)</span><span class="nv">stickyHeaders</span>
                              <span class="nf">topContentInset</span><span class="p">:(</span><span class="n">CGFloat</span><span class="p">)</span><span class="nv">topContentInset</span>
                                <span class="nf">stretchToEdge</span><span class="p">:(</span><span class="n">BOOL</span><span class="p">)</span><span class="nv">stretchToEdge</span><span class="p">;</span></code></pre>

                        </div>
                        <div class="language">
                          <p class="aside-title">Swift</p>
                          <pre class="highlight swift"><code><span class="n">convenience</span> <span class="nf">init</span><span class="p">(</span><span class="nv">stickyHeaders</span><span class="p">:</span> <span class="kt">Bool</span><span class="p">,</span> <span class="nv">topContentInset</span><span class="p">:</span> <span class="kt">CGFloat</span><span class="p">,</span> <span class="nv">stretchToEdge</span><span class="p">:</span> <span class="kt">Bool</span><span class="p">)</span></code></pre>

                        </div>
                      </div>
                      <div>
                        <h4>Parameters</h4>
                        <table class="graybox">
                          <tbody>
                            <tr>
                              <td>
                                <code>
                                <em>stickyHeaders</em>
                                </code>
                              </td>
                              <td>
                                <div>
                                  <p>Set to <code>YES</code> to stick section headers to the top of the bounds while scrolling.</p>
                                </div>
                              </td>
                            </tr>
                            <tr>
                              <td>
                                <code>
                                <em>topContentInset</em>
                                </code>
                              </td>
                              <td>
                                <div>
                                  <p>The top content inset used to offset the sticky headers. Ignored if stickyHeaders is <code>NO</code>.</p>
                                </div>
                              </td>
                            </tr>
                            <tr>
                              <td>
                                <code>
                                <em>stretchToEdge</em>
                                </code>
                              </td>
                              <td>
                                <div>
                                  <p>Specifies whether to stretch width of last item to right edge when distance from last item to right edge &lt; epsilon(1)</p>
                                </div>
                              </td>
                            </tr>
                          </tbody>
                        </table>
                      </div>
                      <div>
                        <h4>Return Value</h4>
                        <p>A new collection view layout.</p>
                      </div>
                    </section>
                  </div>
                </li>
              </ul>
            </div>
          </section>
        </section>
        <section id="footer">
          <p>&copy; 2019 <a class="link" href="https://twitter.com/fbOpenSource" target="_blank" rel="external">Instagram</a>. All rights reserved. (Last updated: 2019-11-20)</p>
          <p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.12.0</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
        </section>
      </article>
    </div>
  </body>
</div>
</html>
